The insider claims the couple, who announced in a joined statement issued last Thursday that they were splitting after less than three years of marriage, had been separated for a couple of months, but had been having problems for the better part of a year.

The source blames their bicoastal lifestyle for the split, insisting Jen “really tried to make it work with him, but the distance was a factor as he only wanted to live in NYC and there was no compromise with her.”

As for how Jen’s been holding up since the announcement, another source tells the entertainment news website she’s been up and down.

“Jen was doing OK for a few weeks after Justin left, and then things got stirred up again when the announcement was made to the media,” says the source,” adding that Aniston, 49, is “adjusting to living by herself and not having Justin around.”

“She is used to the empty house since it’s been months now without him, the source continues, “but it’s still an uneasy feeling for her. She knows in due time she will feel tremendously better, but is really going through the motions right now.”

The source tells E! that Aniston’s been leaning on her former Friends co-star Courteney Cox, who’s been “by her side through it all.”

As for a possible reunion with her ex Brad Pitt, who himself separated from wife Angelina Jolie in September, 2016, Aniston says “that chapter is sealed and so far in the past,” according to the insider. Aniston and Pitt divorced in 2005 after five years of marriage.